Sailboat



Dec. 13, 1938.

A` SCHLUMPF SAILBoAT Filed sept. 5, 193e 2 Sheets-Sheet l Dec. 13, 1938. v A. sci-H LJMPF4 2,140,250

sAILBoAT Filed sept. 5, 1956 2 sheets-sheet 2 R w L... A

Patented Dec. `13, 1938 PATENT GFFICE SAILBOAT Albert Schlumpf,

Application September Zurich, Switzerland 5, 1936, Serial No. 99,562

In Switzerland September 12, 1935 1 Claim.

My invention relates to a sailing boat and especially to a collapsib-le sailing boat.

One object of my invention is to provide a collapsible sailing boat which can be collapsed in a simple manner and transported in the form of hand luggage. The sailing boat according to my invention has in spite of its low weight a considerable stability, is entirely seaworthy and very rapid.

The advantages of my invention and the other objects attained thereby may be better understood in connection with the description of the sailing boat embodying my invention based on the accompanying drawings, in which Fig. l shows a side elevation,

Fig. 2 is a front view, and

Fig. 3 is a plan View.

Figs. 4, 5 and 6 show a second embodiment of my invention; identical parts of the latter are referred to with identical numbers.

The sailing boat (twin jawl) shown in the drawings is provided with a frame I which is reinforced against torsion by a pyramid-shaped, preferrably three part, mast 2 and the necessary shrouds 3. In this case either two spars of the mast engage with the frame in the neighbourhood of the middle of the boat, Whilst the third spar serves at the same time as a rigid fore-stay and is attached to the frame at the front, or a central main mast is supported towards both sides by auxiliary spars which may for example be constructed as X-supports.

The frame I carries a sword 4 which is preferably rotatably mounted about an axis (4 in Fig. 4) whereby the lateral centre of gravity can be brought into register with the centre of gravity of the sails, and a rudder 5, formed as a paddle, as also two inflatable floats 6 which are connected together by a bottom l.

The sword 4 may also be secured to a rail I3 with which there engages the fore leech.

The lling of the floating bodies 6 with air is effected automatically and without any separate devices in that the air containers, suspended from the bottom I, are for example formed of a resistant rubber skin; when suspended, by lifting the frame, they have the tendency, by reason of the action of gravity, to assume the lowest possible position, completely ll themselves with air through the open valves 8 (Fig. 3) until they have acquired a spindle-like shape. A slight auxiliary assistance by means of bellows or the like suffices to tension the oating bodies so tightly that they form an ideal smooth submarine. A soft rubber strip inserted in the skin of the float serves as a safety device in that it expands when the en closed air is subjected to higher pressure (in consequence of heating and so forth) and enlarges: the capacity of the floating bodies so that there always obtains substantially the same pressure.

Transverse stays 9 (Figs. 2 and 3) prevent rising of the floating bodies rigidly connected to the lateral holms of the frame and transmit the forces which occur during sailing.

The connection of the sails to the spars is eiected at the inlet edge II of the wind in the manner that the sail-cloth is passed around the spars so as to form a sheath I2 and is connected to the sail surface located behind the spar. When the sail is inflated by the wind the spars located in the sheath I2 are enclosed in a streamline manner. 'I'he sail laths are passed into the sheath I2 and terminate in recesses in the spars. The resultant increase of the sail surface in the drawn up position amounts to about 50% according to the investigations of Dr. Curry in the Aerodynamischen Versuchtsanstalt Gttingen. By reason of the pyramid-shaped mast the gaf can be placed vertically whereby the eiciency of the sail is further improved.

After removal of the mast and the sails the boat can be placed in this position on the ground so that a tent may be erected over the transverse members 9. The floats filled with air, which form a support for the members 9, serve as an insulation against cold and dampness. They thus replace the hitherto usual pneumatic mattresses which must otherwise be transported separately.

All the parts of the frame and the bottom are connected together detachably. As two floats are used (instead of only a single large float) it is possible to collapse the whole boat and to carry it about as hand luggage.

The pyramid-shaped mast 2, which in the form of construction shown consists of three rods, can be used as a carrier for a tent stop which is passed around the part of the mast located under the point 2'. There is thus formed a kind of cabin which, however, can also be used as a tent for passing the night on the sand.

According to another form of construction, the floats may consist at least partly of an expandible material, so as to compensate the inner air pressure when the floats are getting hot and to increase the loading capacity.

What I wish to claim is:-

A sail-boat, including two elongated inflatable oats 6 spaced apart, a marginal frame I embracing the iioats` above the water line, a bottom 'I extending from one side of the marginal frame over the floats and down between the floats to a plane between the Water line and that containing the marginal frame, transverse stays 9 Connecting the sides of said marginal frame together, a sword 4 pivotally mounted between the floats and passing downwardly through a slit in said bottom, a pyramid mast 2 supported by said marginal frame, a sail carried by said mast, said marginal frame, said bottom and said transverse stays being detachably connected together and to said floats substantially as shown and described. 5

ALBERT SCHLUMPF. 

